Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Figs 
Figs 
1 
2 and 
22 and 
. 24 and 
. 26 
to 
14 to 
17 to 
to 2 
10 to 13. 
10. 
10. 
13. 
16. 
18. 
19% 
20 and 21. 
Siow 
bo 
ie) 
bw 
oO 
-~I 
a 
PLATE .G. 
CXYEINDROCGIL TAS MENNESOTENSIG# WilL CIR sp oiota here ley= le latel=lel= ole] ole (eio!eta!s\e]olelsie/elsialielelelejeiatar= 
A small specimen, covered in part by a bryozoan; natural size. Also end view of 
same, showing numerous unequal canals. 
A large fragment having canals of unusual size; and an end view of the same; 
natural size. Upper part of the middle third of the Trenton shales, St. Paul, 
Minn. Collection of KE. O. Ulrich. 
Hin TEROSPONGTAGCSUB HAMOS At IPL }iayetetslosoiofeiatelsiotelelelolcvere level ofevatel elotelerslelelelat=toretelal-yalalelai= 
A fragment of the natural size, doubtfully referred to this species. Hudson River 
group, Spring Valley, Minn. Collection of E. O. Ulrich. 
Vertical and tangential sections, x 10, of a typical specimen from Cincinnati, O. 
HINDIA PAR VA WIriCh i... (1-1 == ApSpuOOoOO oS Doode so saondECn UntAaucHDoAoIroee os 
Three specimens of this species, showing extremes in size so far observed. 
Vertical and tangential sections x 10. Upper third of the Trenton shales and 
Galena shales, Goodhue and Fillmore counties, Minn. Collection of E. O. 
Ulrich. 
TCH EN ARAM IS YaPAn to CIE bspSP MEL OV je slelerteleleletelatelotarenstelatete olatelelarfelatatevelotst-(ociststetatetealslete 
A large colony of this species growing upon a fragment of Callopora incontroversa 
Ulrich, x 2. 
A small colony in which one of the buds has grown in a manner suggesting 
Aulopora, x 5. 
A longitudinal section through a large colony. Trenton shales, Minneapolis, 
Minn. University of Minnesota collection. 
A small free mass of this species, of the natural size, and a portion of the same x 3. 
The latter shows at a, and in the space to the right, a pore passing from the 
parent tube into the base of the buds. This fact is important in this that it 
indicates a relationship of Lichenaria with the Auloporide, rather than with 
Columnaria, where we have placed the genus provisionally. Middle third of 
the Trenton shales, St. Paul, Minn. Collection of E. O. Ulrich. 
CODUDINARTAG (2) pea Te ING CHOISOM eisrelalelaletes Ielatelelereloistele re ele[areielslaletelsialeleleieioioiaslstetetisielere 
A portion of the surface, to show the septal ridges. Trenton shales, St. Charles, 
Minn. Minnesota Geological Survey collection. 
Part of a vertical section, enlarged five times, showing the tabule. (After 
Nicholson.) 
Part of a transverse section, showing the amalgamation of the walls of the coral- 
lites and the marginal septa. (After Nicholson.) 
STREPTELASMA PRON UIND UM O Wem sacle yotecrelsietatetari=ttetotalnetatats aretetellelsinicrevorcietsteletelsisieie 
View of a natural cast of the visceral cavity, the usual mode of occurrence in the 
Trenton limestone, Minneapolis, Minn. 
An entire specimen in which a portion has been broken away to show the great 
depth of the body cavity. 
View of the visceral cavity, showing the three fossule and the counter septum. 
Base of the Upper Buff limestone, Mineral Point, Wisconsin. Minnesota Geo- 
logical Survey collection. 
SPRL ET ASMA UC ORIN TC sla OMe AEM ate saverale er s/aic/e\cierstorerebeteteleveleteieteloiatevcievctectsievstisvee\cla/elaieiere 
An exterior view of a specimen broken so as to show the depth of the visceral 
cavity. 
View of the visceral cavity to show the twisted nature of the septa. Galena 
shales, St. Paul, Minn. Minnesota Geological Survey collection. 
SRRERTEDASMAG RUSTIC UM STI M O'S i eversrelepetetereictetetsieletateiereremicretere/clelolerersvele ste doopoocG Rieieis 
The exterior of an imperfect specimen. 
View of the visceral cavity, Showing a distinct pseudocolumella. Hudson River 
group, Granger, Minn. Minnesota Geological Survey collection. 
PRODTAR:AA VEETUSTA ally Species + <lereieisicy=/cielelnlelseinjels)) slelelela\elnialel 3] 1ai-\els\a)s »\s elvis ie ole! 
A colony of this species growing on a fragment of a strophomenoid shell. 
A portion of same, enlarged five times, showing the septal ridges. Hudson River 
group, Spring Valley, Minn. Minnesota Geological Survey collection. 
AULOPORA (?) TRENTONENSIS, D. SP. .eee ee ceeee ese e eee eect eee ee cee e tees ee ence eens 
A view of a colony of this species; natural size. 
A portion of same enlarged three times. 
An unusually well preserved specimen growing upon Batostoma winchelli Ulrich, 
of the natural size and a portion x 3.5. Middle third of the Trenton shales, 
Minneapolis, Minn. Collection of E. O. Ulrich. 
Se The drawings for figures 1 to 9 are by Mr. Ulrich. 
83 
88 
90 
93 
94 
95 
